Sorry this PR sat for so long. Consul has supported http_api_response_headers for awhile which allow you to define domains for CORS requests. I'm not super familiar with CORS, but I don't think Consul's goal is to support the full specification. I'm also hesitant to add this to a single endpoint and think that, if we do add this, it needs to be done at a higher level. As such, I'm going to close this PR for now.
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